Atomic Structure
Compound Properties
Substances and Mixtures
Chemical Reactions
Kinetics
100
The subshell in which sodium loses electrons to ionize.
What is the 3s subshell?
100
The rule that states that if the charges of two particles are larger and their distance is smaller, then the force between them is greater.
What is Coulomb's Law?
100
The volume of a 11.6M solution, in milliliters, that you need to make 2.00 L of the 3.0M solution.
What is 520 ml?
100
A balanced NET ionic equation for the formation of Silver Chloride and sodium nitrate by adding sodium chloride and silver nitrate.
What is Ag+(aq) + Cl-(aq) → AgCl(s)?
100
The term for the minimum energy required for a reaction to occur.
What is "activation energy"?
200
The reason why a fluorine atom has a smaller atomic radius than an oxygen atom.
What is effective nuclear charge?
200
The thing that has to be zero for all atoms to determine the most stable resonance structure.
What is formal charge?
200
Name and explain all 3 intermolecular forces.
This question does not have to be answered as a "What is" question.
London Dispersion force: instantaneous dipoles
Dipole Dipole interactions: molecules with permanent dipoles are attracted to each other
Hydrogen bonding: strong dipole-dipole among molecules where H is bonded to F, O or N
200
The mass of oxygen (in grams) needed to completely burn 2.50g of magnesium.
What is 1.65g?
200
The rate law for the reaction with this mechanism.
Step 1: NO₂ + F₂ → NO₂F + F (slow)
Step 2: F + NO₂ → NO₂F (fast)
What is rate = k[NO₂][F₂]?
300
The energy of a 0.05 picometer light wave.
What is 3.97 * 10^-12 Joules?
300
The correct identification of the strongest ionic compound out of NaCl, MgF2, and KI, and the reason that this is the case.
What is MgF2?
What is lattice energy?
300
CO2(g), N2(g) , HF(aq), SiO2(s), HBr(aq)
1. The molecule with the strongest intermolecular forces at STP.
2. The molecule with the highest effusion rate as a gas.
1. What is SiO2? (Not only is it a solid, it is a covalent network solid too!)
2. What is HF? (Lower molar mass means higher effusion rate.)
300
The balanced equation for the combustion of acetic acid (CH3COOH). State signs are not needed.
What is 2CH3COOH(l) + 5O2(g) → 4H2O(g) + 4CO2(g)?
300
Consider this graph:
1. The order of the reaction.
2. What the slope of the ln[A] graph represents in terms of kinetics.
1. What is a first order reaction?
2. What is the negative rate constant? (also accept "What is -k?")
400
The element in Period 3 in which the difference in third and fourth ionization energies is MUCH greater than the difference in second and third ionization energies.
What is Aluminum?
400
The molecular geometry, electron geometry, AND bond angle of the polyatomic ion NO3-.
What is Trigonal Planar, Trigonal Planar, and 120o?
400
A chemist is making 2 solutions. One with CO2 gas as the solute, another with NaCl as the solute in the same amount of water.
The solution with the lowest freezing point (and an explanation).
The solution with the lowest boiling point (and an explanation).
The solute that is the least soluble at 400 K (and an explanation).
These do not have to be answered in a "what is" format.
1. NaCl because after it dissociates the solution will have a higher concentration of solute particles. (freezing point depression)
2. CO2 because less moles of particles are in the solution than NaCl solution.
3. CO2 because it is a gas solute, and at high temperatures they are generally less soluble. It is also nonpolar, so its London dispersion forces do not interact with water molecules' dipole dipole forces as much.
400
A 1.50 g sample of a compound produces 2.20 g CO₂ and 1.26 g H₂O. The Molar mass of the compound is 124 g/mol.
Task: The chemical formula for this compound.
What is C4H12O4?
400
The decomposition of hydrogen peroxide follows a first-order reaction. A student finds that the concentration of hydrogen peroxide drops from 0.800 M to 0.200 M in 54.2 minutes.
1. The rate constant for this reaction. (INCLUDE UNITS.)
2. The half life of H2O2 in hours.
1. What is 2.56 x 10-2 min-1?
2. What is 0.452 hours?
500
The full electron configuration of barium.
What is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s2?
500
The empirical formula of a compound that is 52.14% carbon, 13.13% hydrogen, and 34.73% oxygen by mass.
What is C2H6O? (Fun fact: this is the chemical formula for the alcohol in beer!)
500
12.5 g of aluminum (Al) reacts with 50.0 L of chlorine gas (Cl₂) at 2.00 atm and 298 K. The actual yield of aluminum chloride (AlCl₃) is 80%. After the reaction, the remaining gas is collected over water at 25°C and 1.50 atm (vapor pressure = 0.0313 atm).
Task: Find the total volume (in ml) of Cl2 collected at.
What is 58,800 ml?
500
A 9.00 g sample of an unknown metal M(NO₃)2 is dissolved in water. An excess of sodium sulfate is added, resulting in the formation of 7.60 g of a solid metal sulfate (MSO₄) precipitate.
1. The identification of metal M.
2. The balanced molecular equation for the reaction. (INCLUDE STATE)
1. What is iron (Fe)?
2. What is Fe(NO3)2(aq) +Na2SO4(aq) → FeSO4(s) + 2NaNO3(aq)?
500
For the reaction:
2D + E -> Products
1. The rate law of the reaction.
2. The overall order of the reaction.
3. The rate constant of the reaction. (INCLUDE UNITS)
1. What is Rate = k[D]2[E]2?
2. What is 4th order?
3. What is 10 M-3s-1?